Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Reexamination Certificate
2002-10-10
2004-10-12
Dinh, Tan (Department: 2653)
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
C369S047340
Reexamination Certificate
active
06804179
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an information playback apparatus capable of performing random access playback to start playback from an arbitrary portion, reverse playback, shuttle playback, etc. when playing back information recorded in an information recording medium, such as a CD (Compact Disc), a DVD (Digital Versatile Disc), and an MD (Mini Disc).
The present application claims priority from Japanese Application No. 2001-316552, the disclosure of which is incorporated herein for all purpose.
As a conventional information playback apparatus for playing back information recorded in an information recording medium, such as a CD, a DVD, and an MD, there is known a type furnished with a random access playback function, a reverse playback function, and a shuttle playback function.
The random access playback function is a function to start playing back information from a position called a cue point, and for example, once the user or the like registers the recording position of desired information by the cue point, he/she can readily find the recording position later by automatic search and start information playback therefrom.
The reverse playback function is a function opposite to a forward playback function generally performed for playing back information. Such reverse playback function is used to play back information in a reverse direction, which is otherwise played back in the forward direction with an elapsing of time. For example, the reverse playback function can offer the same advantage attained when an analog record is played by running the stylus on the analog record in a reverse direction by turning the turntable of an analog record player forcedly in the reverse direction.
Hence, as shown in FIG.
8
(
a
) by way of example, when sound information, such as music, recorded in an information recording medium is played back, the waveform of a playback signal S
1
generated and supplied to a loudspeaker or the like in the case of forward playback and the waveform of a playback signal S
2
generated in the case of reverse playback are inverted in the time base direction.
The shuttle playback function offers the same advantage attained when the forward playback and the reverse playback are performed alternately.
For example, the user or the like can perform shuttle playback as he/she rotates a rotator DL (called a jog dial provided to the information playback apparatus) back and forth as shown in FIG.
8
(
b
).
To be more specific, the jog dial DL is provided with a sensor SEN for detecting rotational direction and speed of the jog dial DL, and when the user or the like manipulates the jog dial DL back and forth in a clockwise direction Fw and in a counterclockwise direction Bw alternately, a detection signal Sn whose polarity is alternatively reversed as shown in FIG.
8
(
c
) is outputted, whereby forward playback and reverse playback are performed alternately in accordance with a change in the detection signal Sn. Hence, when the jog dial DL is manipulated back and forth quickly while information, such as music, recorded in an information recording medium is being played back, it is possible to play imitation sounds (scratching sounds, etc.) different from the original music.
Incidentally, the conventional information playback apparatus is provided with a buffer memory for storing information (data) of a certain time duration to achieve forward playback and reverse playback.
As shown in
FIG. 9
which is an example, in the case of forward playback of information (data) A through S recorded on tracks in an information recording medium, data of a certain time duration (data in the forward direction) is read out at a time in advance by the pickup and stored into a buffer memory BMM, so that an original movie or music is played based on the data stored in the buffer memory BMM.
For example, in the case of forward playback of data M, N, O, and so forth, playback from a time point t
1
to a time point t
2
is performed under a condition in which the data M, N, and O is stored in the buffer memory BMM. Upon completion of this playback, playback from the time point t
2
to a time point t
3
is started under a condition in which the data O, P, and Q is stored in the buffer memory BMM. Further, upon completion of this playback, playback from the time point t
3
to a time point t
4
is started under a condition in which the data Q, R, and S is stored in the buffer memory BMM. By repeating the same processing thereafter, seamless forward playback can be accomplished.
In the case of reverse playback, as shown in
FIG. 10
which is an example, data of a certain time duration (data in the reverse direction) is read out at a time in advance by the pickup and stored into the buffer memory BMM, so that the data stored in the buffer memory BMM is played back in the reverse order.
It should be noted, however, that, in the case of an information recording medium, such as a CD and a DVD, there is a limit that data on the tracks always has to be read out along the forward direction, which complicates the readout processing in the case of reverse playback in comparison with the case of forward playback.
For example, in the case of reverse playback of data L, K, J and so forth in a sequence in the reverse direction, the pickup is at first moved to the position of the data J, then the data J, K, L is read out and stored into the buffer memory BMM. Subsequently, reverse playback from a time point t
1
to a time point t
2
is performed by playing back the data K and L in the reverse direction, and further, the pickup is moved to the position of the data H during this reverse playback to start reading the following data H and I as soon as possible.
Then, reverse playback from the time point t
2
to a time point t
3
is performed by playing back the data I and J out of the data H, I, and J stored in the buffer memory BMM in the reverse direction, and further, the pickup is moved to the position of the data F during this reverse playback to start reading the following data F and G as soon as possible.
Then, reverse playback from the time point t
3
to a time point t
4
is performed by playing back (in the reverse direction) the data G and H out of the data F, G, and H stored in the buffer memory BMM, and further, the pickup is moved to the position of the data D during this reverse playback to start reading the following data D and E as soon as possible.
Accordingly, seamless reverse playback can be achieved by repeating the foregoing processing.
However, in the case of shuttle playback for performing forward playback and reverse playback alternately, data for forward playback and data for reverse playback need to be updated and stored alternately into the buffer memory BMM at each transition from forward playback to reverse playback or from reverse playback to forward playback. Hence, the pickup has to be moved promptly to a position of particular data. However, in practice, it is difficult to move the pickup promptly to a position of particular data, and therefore, there may be a case that shuttle playback cannot be achieved in association with the rotations of the jog dial. In particular, there is a problem that shuttle playback cannot be achieved when the jog dial is manipulated back and forth too fast.
Also, in the case of the aforementioned random access playback from an arbitrary portion, when access is made to data positioned at a cue point remote from data currently being played back, it takes a long time to move the pickup to the position of the data to be accessed, and for this reason, a desired quick random access playback cannot be achieved.
Particularly, in the case a user or the like may wish to perform shuttle playback immediately after accessing a desired portion, and at this time, a considerably large load will be applied to the pickup, resulting in a situation which not always but often makes it impossible to achieve playback processing in the manner as the user or the like desires.
SUMMARY OF THE INVENTION
The present invention is devised to solve th
Eguchi Hiroyasu
Koizumi Harui
Miyashita Masahiko
Ogura Koji
Arent Fox
Dinh Tan
Pioneer Corporation
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